MESON Chess Problem Database

Problem Display
PID: 136712 (Q7/2B4B/4p3/2Kn1r2/1RN1k3/3pp3/7N/2q5 w - - 0 1)

Ellerman, Arnoldo

The Field, 1921

(First published on Sat May 14 1921)

Q7/2B4B/4p3/2Kn1r2/1RN1k3/3pp3/7N/2q5

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Sxb2#
      • 2.Sd2#
    • 1...Qd2
      • 2.Sxd2#
    • 1...Qa3
      • 2.Sd2#
      • 2.Sxa3#
    • 1...Qa1
      • 2.Sb2#
      • 2.Sd2#
    • 1...Qb1
      • 2.Sb2#
      • 2.Sd2#
    • 1...Qd1
      • 2.Sb2#
      • 2.Sd2#
      • 2.Sa3#
      • 2.Sa5#
      • 2.Se5#
      • 2.Sb6#
    • 1...Qe1
      • 2.Sd2#
    • 1...Qf1
      • 2.Sb2#
      • 2.Sd2#
      • 2.Sa3#
      • 2.Sa5#
      • 2.Se5#
      • 2.Sb6#
    • 1...Qg1
      • 2.Sb2#
      • 2.Sd2#
      • 2.Sa3#
      • 2.Sa5#
      • 2.Se5#
      • 2.Sb6#
    • 1...Qh1
      • 2.Sb2#
      • 2.Sd2#
      • 2.Sa3#
      • 2.Sa5#
      • 2.Se5#
      • 2.Sb6#
    • 1...Qxc4+
      • 2.Rxc4#
  • Tries
    • 1.Bxf5+?
      • 1...exf5
        • 2.Qxd5#
      • 1...Kxf5!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qd4#
        • 2.Qe5#
      • 1...Qxc4+
        • 2.Rxc4#
      • 1...Sc3+
        • 2.Se5#
      • 1...Sxb4+
        • 2.Qe5#
      • 1...Sf4+
        • 2.Qe5#
      • 1...Sb6+
        • 2.Qe5#
      • 1...Sf6+
        • 2.Qe5#
      • 1...Sxc7+
        • 2.Qe5#
      • 1...Se7+
        • 2.Qe5#
      • 1...Qxa1
        • 2.Sd2#
      • 1...d2
        • 2.Qd4#
      • 1...e5
        • 2.Qxe5#
      • 1...Qb2
        • 2.Sd2#
      • 1...Qc3
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 12
    • REMOVED MATES = 2
  • Sets
    • Q(a);N_PINS(C)::R(B)+S(C),DCHECK,XQ(a)
    • Q(a);N_PINS(C)::R(B)+S(C),DCHECK
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(C)::R(B),XQ(a)
  • Tries
    • Try
      • B(F);CHECK,XR(f)
      • Vars
        • P(g);XB(F)::QAB1(G),XS(e)
      • Refutation
        • K(d);N_SPINS(e),S_FLIGHT,XB(F)
  • Actual
    • Q(G);N_PINS(e)
    • Threat
      • DUALS(2)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XS(C)::R(B),XQ(a)
      • S(e);CHECK,N_PINS(C)::R(B)+S(C)
      • S(e);CHECK,XR(B)::QAR1(G)
      • S(e);CHECK::QAR1(G)
      • S(e);CHECK,XB(E)::QAR1(G)
      • Q(a);N_PINS(C),XQ(G)::R(B)+S(C),DCHECK
      • P(b);::QAR1(G)
      • P(g);::QAR1(G),XP(g)
      • Q(a);N_PINS(C)::R(B)+S(C),DCHECK
      • Q(a);OGATE::QAB(G)
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